Mechanical Aptitude Basic Electrical Circuits Flashcards
7 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical Aptitude Basic Electrical Circuits flashcards as text
Which type of circuit breaker characteristic makes it suitable for protecting motors against startup current surges?
Answer: Time-delay (slow-blow) breaker
Time-delay breakers tolerate brief current surges like motor startup without tripping, while still protecting against sustained overloads.
In a parallel circuit with a 24V source and two resistors (6 ohms and 12 ohms), what is the total current from the source?
Answer: 6 amps
Current through 6Ω = 24/6 = 4A; current through 12Ω = 24/12 = 2A; total = 4 + 2 = 6 amps.
What does a 'ground' connection in an electrical circuit primarily provide?
Answer: A safe return path and protection against shock
Grounding provides a low-resistance path to earth that protects people from electrical shock if insulation fails.
How much energy (in watt-hours) does a 100-watt light bulb consume if left on for 8 hours?
Answer: 800 watt-hours
Energy = Power × Time = 100W × 8h = 800 watt-hours.
What is the function of a capacitor in an electrical circuit?
Answer: It stores and releases electrical energy
A capacitor stores electrical energy in an electric field between two conductive plates and can release that energy back into the circuit.
If a 60-watt bulb and a 100-watt bulb are connected in series across 120V, which bulb glows brighter?
Answer: The 60-watt bulb
The 60-watt bulb has higher resistance (at rated voltage), and in series, more resistance means more voltage drop and more power dissipated in that component.
What is the SI unit of electrical charge?
Answer: Coulomb
The coulomb is the SI unit of electric charge; one coulomb equals the charge transferred by one ampere flowing for one second.